Add Pprof profiling endpoint

[XAMPPRocky]

This adds a proof profiling endpoint for Quilkin, allowing Quilkin to be continuously profiled using tools like Grafana Phlare.

[markmandel]

Looks like a formatting issue, but otherwise should be fine.

Also thinking because of this PR, we should get another release out this month.

[XAMPPRocky]

Yeah, though I need to make some changes as with the current implementation, we run out of memory pretty quickly right now, so I need to add some limits to stop that.

[markmandel]

Oops, that's no good 😄

I did have couple more thoughts this morning:

1. Should we have some kind of admin option to turn this off?
2. We should also document this somewhere 😁

[markmandel]

Just watching an amazing talk about continuous profiling at GDC -- rather than baking in profiling, instead we could look at a eBPF profiler such as https://pyroscope.io/ to run low overhead continuous profiling on both GameServers and Quilkin itself.

I believe the only requirements are to have debug symbols (in some capacity) and frame pointers (I have not looked into details, just writing notes post talk).

[quilkin-bot]

Build Failed 😭

Build Id: d3507576-0196-4254-8ed6-ba1cd0acc82f

Status: FAILURE

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[XAMPPRocky]

Closed in favour of #875